For Experienced players only. This complete gearbox set is essentially a pre-assembled complete reinforced / tune up kit for your M4 / M16 series AEG. Manufactured by Matrix Tactical Systems, one of the most established, reliable and well known Airsoft manufacture in the world. This gearbox is an affordable alternative over the Systema gearbox with 8mm bearing sets. The Mecha box shell is modeled after Systema's new gearbox design with thickened shell. With the more stabilized 8mm bearing set, this gearbox is more attractive than ever!

Complete Gearbox Disclaimer:We have compiled a series of videos for AEG take down, assembly and gearbox for your reference. Recommended for experienced players only. A "gearbox" virtually never breaks, Evike.com offers spare parts for all components. All gearboxes are sold as complete set of parts and "AS IS". All the gearbox are directly from manufacture. Buyer responsible for fine tuning and proper installation. Evike.com is not responsible for shimming it perfectly or playing the game of airsoft for you.For more information on complete gearboxes, please visit: Complete AEG Gearbox

Review:A good gearbox on par with the KWA M4 gearbox. One advantage of this gearbox over the KWA is that all 6 bearings are standard size 8mm bearings you can buy. Making it much easier to work on. The monster gear set can power up to M170 spring combined with magnum motor. The inner wall of the gearbox is reinforced, just like the Systema new type Mecha box shell, with all the inner walls thickened. Easy installation for most major brands of M4 / M16 series AEG. Great performance.To install this gearbox on a MOD5 series, although it is a version 2, the nozzle, selector plate and trigger are not the same. Slight work and gearbox knowledge will be required.

"This gearbox is great, I have had no problems with it after firing quite a few HiCap Mags (300 BBs.) worth of BBs.

the mix of Tourque-Up/High Speed Gears inside this Gearbox privde a nice home for my Tienly U-30000 Motor, which is powered by a 9 Volt nunchuck,

I want to address something in this review that I believe is a big deal. Make sure you look at the wiring that connects the battery to the gearbox, If the connectors are both FEMALE/FEMALE Connectors, it won't work on this Gearbox. The Gearbox to Battery wiring on this Gearbox are MALE/FEMALE Connectors.

SO...make sure you have Male/Female connectors on your Battery/Fuse to Gearbox wiring to connect to this Gearbox.

the only Gripe I have about this product is the actual FPS I have after installing it.
It shoots at about 480 FPS! So I am going to keep it at that for a DMR/LMG build I am going to make.

I hope this review helped, It'll save you the hassle I went through with Evike's RMA Process when I realized my battery wiring would work with this badass.

by gregg h. on 10/10/2013

"Great Gear box..perfect fit ect..came as stated..I do have one issue..It will shoot fine for several rnds then it will not fire anything for several shots..Installed new hop and ver2 6.03 tbb.Hop seems to be adjusted correctly, shoots hard and straight for approx 120ft when it does fire correctly..

by sky M. on 08/13/2013

"I just ordered mine, planning on putting a m 100 in it but I also was wondering on will I need a mosfet for this or will it be just fine.My plan is to do a high speed setup. Thanks!

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